EP4151175B1 - Lip/cheek holder and system comprising intra-oral scanner and lip/cheek holder - Google Patents

Lip/cheek holder and system comprising intra-oral scanner and lip/cheek holder Download PDF

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Publication number
EP4151175B1
EP4151175B1 EP21197991.9A EP21197991A EP4151175B1 EP 4151175 B1 EP4151175 B1 EP 4151175B1 EP 21197991 A EP21197991 A EP 21197991A EP 4151175 B1 EP4151175 B1 EP 4151175B1
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EP
European Patent Office
Prior art keywords
lip
film
sliding element
cheek
retainer according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP21197991.9A
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German (de)
French (fr)
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EP4151175C0 (en
EP4151175A1 (en
Inventor
Markus Lichtensteiger
Wolfgang Wachter
Lukas ENGGIST
Frank Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ivoclar Vivadent AG
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Ivoclar Vivadent AG
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Filing date
Publication date
Application filed by Ivoclar Vivadent AG filed Critical Ivoclar Vivadent AG
Priority to ES21197991T priority Critical patent/ES2965361T3/en
Priority to EP21197991.9A priority patent/EP4151175B1/en
Priority to CN202210795750.7A priority patent/CN115836832A/en
Priority to KR1020220083449A priority patent/KR20230042549A/en
Priority to US17/933,738 priority patent/US20230094777A1/en
Priority to JP2022150338A priority patent/JP2023046315A/en
Publication of EP4151175A1 publication Critical patent/EP4151175A1/en
Application granted granted Critical
Publication of EP4151175C0 publication Critical patent/EP4151175C0/en
Publication of EP4151175B1 publication Critical patent/EP4151175B1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/90—Oral protectors for use during treatment, e.g. lip or mouth protectors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/24—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the mouth, i.e. stomatoscopes, e.g. with tongue depressors; Instruments for opening or keeping open the mouth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C2201/00—Material properties

Definitions

  • the invention relates to a lip/cheek holder according to the preamble of claim 1 and a system consisting of an intraoral scanner and a lip/cheek holder, according to the preamble of claim 16.
  • Lip/cheek retainers have been known for a long time and have established themselves on the market under the brand “Optragate” from Ivoclar Vivadent AG.
  • Such lip/cheek holders have a lip ring which extends around the patient's mouth opening adjacent to the lips, and a vestibular ring which extends in a substantially ring-shaped manner in the patient's vestibule. These rings are connected to each other via an elastic film.
  • the dentist regularly inserts instruments into the inside of the mouth. These instruments usually come into contact with the lip/cheek retractor foil both during insertion and sometimes during removal.
  • the instruments usually have a metallic shaft and slide along the foil.
  • a suction hose of a saliva ejector is hung over the lip and thus over the film of the lip cheek holder and lies there continuously.
  • the use of a film that slides well represents a compromise.
  • the film should be as thin as possible in order to be able to adapt smoothly to the patient's mouth.
  • it should be tear-resistant.
  • the material of choice for the film is typically an elastomer. This is highly elastic, but has rubber-like properties.
  • an intraoral scanner which typically has a plastic shaft, is inserted into the patient's mouth, the so-called stick-slip effect easily occurs. This causes the scanner to briefly get stuck on the film and then detach itself from the film as the scanner continues to move.
  • the invention is based on the object of providing a lip/cheek holder according to the preamble of claim 1 and a system consisting of one To create an intraoral scanner and a lip/cheek holder according to the preamble of claim 16, which is better suited for a trouble-free workflow in the dental practice.
  • the film of the lip/cheek holder is provided with a sliding element produced by treating the relevant surface of the film at least at the relevant points, i.e. at the points where contact with a shaft can occur.
  • the sliding element can be either an atomic deposition coating or a surface modification. It has a significantly lower coefficient of sliding friction than a typical rubber-like elastomer. This can be, for example, 1.5 or 1.0.
  • the sliding element is significantly harder and therefore more brittle than the rest of the film body.
  • tests have shown that in practice the film of the lip/cheek holder is at least equally safe against tearing. This is probably due to the fact that the stick-slip effect is certainly avoided and therefore the forces to which the film is exposed during handling are significantly reduced.
  • the sliding element can also be created by a combination of atomic deposition and surface modification, or only by atomic deposition. When a surface is coated with silicon dioxide, a surface modification can also be achieved.
  • a dental mirror as a dental instrument typically has a metallic shaft.
  • An intraoral scanner typically has a replaceable scan head. This can, for example, consist of polyurethane or, better, autoclavable polysulfone. Compared to these materials, the coefficient of sliding friction is, according to the invention, less than 2.
  • the sliding element according to the invention extends only on the inside of the essentially tubular lip/cheek holder in the initial state. Either the inside is completely provided with the sliding element. Or only the middle area of the inside, i.e. the area that is spaced from both rings and rests at the lip transition to the oral cavity, is provided with the sliding element.
  • This solution has the advantage that there is no contact between the sliding element and the patient's mucous membrane, not even in the vestibule, since the film then has no sliding element adjacent to the vestibular ring. It is also possible to omit the sliding element only adjacent to the vestibular ring, for example only over the 20 or 30% of the length of the lip/cheek holder that adjoins the vestibular ring.
  • FIG. 1 an intraoral scanner 10 and a lip/cheek holder 12 are shown.
  • the intraoral scanner 10 has a gripping handle 14 and a shaft 16.
  • the shaft 16 can be removed together with the scanning head 18 and is releasably attached to the gripping handle 14.
  • the diameter of the shaft 16 is 20mm in the illustrated embodiment.
  • the scanner 10 is guided along the dental arch for the scan. It is introduced into the vestibule 26.
  • the upper lip 30 - and of course also the lower lip 28 in the case of the scan in question - must be pressed in in order to reach the height of the relevant dental arch with the scan head 18. This requires a corresponding contact pressure.
  • the lip/cheek holder 12 consists of a film 20 and a lip ring 22 and a vestibular ring 24.
  • the film 20 extends between the lip ring 22 and the vestibular ring 24.
  • the film 20 thus forms a tubular section between the rings.
  • the vestibular ring 24 has a slightly smaller diameter than the lip ring 22 and is intended to be inserted into the vestibule 26 of a patient. When the lip/cheek holder 12 is stretched, it has a constriction between the lip ring 22 and the vestibular ring 24.
  • the film 20 covers the lower lip 28 and the upper lip 30 of the patient in a manner known per se and prevents direct contact between the lips 28 and 30 and the shaft 16, even when the patient closes his lips around the shaft 16.
  • the film 20 has an inside 32 and an outside 34.
  • the inside 32 is the side facing the shaft 16 and the outside 34 is the side facing the lips 28 and 30.
  • the inside 32 of the film 20 is provided with a sliding element 36.
  • the sliding element 36 has been produced by a surface treatment of the film 20, more precisely the inside 32 of the film, and has a low coefficient of sliding friction of 1.
  • the sliding element 36 extends over the inside 32 of the tubular section of the film 20 only in the area of the constriction, i.e. at a distance from the rings.
  • the film 20 has a thickness of 0.2 mm.
  • the sliding element 36 has a thickness in the atomic range or slightly above the atomic range.
  • the sliding element 36 is created so that it is with the film is firmly anchored.
  • it consists of silicon dioxide particles that are at least partially embedded in the surface of the film 20. This special type of surface coating makes it possible for no elements of the sliding element 36 to detach from the film 20, even under high shear loads.
  • Fig. 2 Out of Fig. 2 is a slightly enlarged view of the investment area at the circled location Fig. 1 between the sliding element 36 and the shaft 16 can be seen.
  • the film 20 with the sliding element 36 is brought into a straight shape by the contact with the shaft 16, and the lip 30 is deformed accordingly.
  • the thickness of the sliding element 36 is shown exaggerated so that the sliding element 36 can be shown at all. According to the invention, a relative movement between the intraoral scanner 10 and the lip 30 is possible with very little force, even if there is a typical contact pressure of 1 to 10 Newton.
  • the sliding element 36 ensures that no stick-slip effect occurs; rather, when moving in the direction 40, there is a uniform sliding between the shaft 16 and the lip/cheek holder 12. The difference between static friction and sliding friction is corresponding small amount.
  • Fig. 3 is an enlargement of the detail corresponding to that in Fig. 2 circle shown.
  • another sliding element 36 according to the invention is used.
  • the film 20 is in the embodiment according to Fig. 3 coated with para-xylylene. This is also an atomic separation.
  • the surface of the Para-Xylylene coating is more homogeneous and smooth and offers a low coefficient of sliding friction compared to the shaft 16 made of polysulfone.
  • the coefficient of sliding friction averages between 0.9 and 1.2, with certain fluctuations.
  • a further modified embodiment of a lip/cheek holder 12 according to the invention is available Fig. 4 visible.
  • microstructures are created on or on the surface of the elastomer of the film 20. These consist of mountains 42 and valleys 44, which alternate with each other. The mountains 42 project towards the shaft 16 and the valleys 44 project back from it.
  • the contact areas 46 of the sliding element 36 remain unchanged or essentially, i.e. more than 80%, unchanged when the film 20 is stretched, and the stretching increases the distances between the contact areas 46.
  • the mountains 42 are evenly distributed over the surface of the sliding element 36.
  • the size of the mountains 42 i.e. the thickness of the microstructure 48, can be chosen in any suitable manner, for example between the atomic range and a few micrometers.
  • the microstructure 48 can be incorporated in negative form into the surface of an injection mold, and the injection molding then automatically creates the microstructure 48 of the sliding element 36.
  • microstructures 48 are designed in the form of pyramids. These have pointed mountains 42 and valleys 44, which also taper to a point. However, the design of the valleys plays no role with regard to the coefficient of static friction.
  • Polysulfone was chosen because the shaft 16 of intraoral scanners 10 often consists of polysulfone.
  • the contact pressure was varied between 1 and 5 N.
  • the movement speed during the sliding friction measurement was approximately 6mm/s.
  • microstructure size was changed between the grid masses 50 ⁇ m and 200 ⁇ m and the pyramid height between 24 ⁇ m and 87 ⁇ m.
  • the coefficient of friction was reduced by between 22 and 25% in comparison with an elastomer strip, or by 37% in another test arrangement, at the maximum tested microstructure size.
  • the embodiments according to the invention have the particular advantage that there is a comparatively small difference between the coefficient of static friction and the coefficient of sliding friction

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Surgery (AREA)
  • Epidemiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • Medical Informatics (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Biophysics (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Surgical Instruments (AREA)
  • Audiology, Speech & Language Pathology (AREA)

Description

Die Erfindung betrifft einen Lippen/Wangen-Halter gemäß dem Oberbegriff von Anspruch 1 sowie ein System aus einem Intraoralscanner und einem Lippen/Wangen-Halter, gemäß dem Oberbegriff von Anspruch 16.The invention relates to a lip/cheek holder according to the preamble of claim 1 and a system consisting of an intraoral scanner and a lip/cheek holder, according to the preamble of claim 16.

Lippen/Wangen-Halter sind seit langen bekannt und haben sich unter der Marke "Optragate" der Firma Ivoclar Vivadent AG am Markt durchgesetzt.Lip/cheek retainers have been known for a long time and have established themselves on the market under the brand “Optragate” from Ivoclar Vivadent AG.

Derartige Lippen/Wangen-Halter weisen einen Lippenring auf, der sich an den Lippen anliegend um die Mundöffnung des Patienten erstreckt, und einen Vestibulärring, der sich im Vestibulum des Patienten im Wesentlichen ringförmig erstreckt. Diese Ringe sind über eine elastische Folie miteinander verbunden.Such lip/cheek holders have a lip ring which extends around the patient's mouth opening adjacent to the lips, and a vestibular ring which extends in a substantially ring-shaped manner in the patient's vestibule. These rings are connected to each other via an elastic film.

Die Lippe des Patienten wird hierdurch abgedeckt und geschützt. Der Zahnarzt kann im Mundinnenraum des Patienten die notwendigen Behandlungsschritte vornehmen, ohne dass die Gefahr gegenseitiger Infektionen durch Schleimhautkontakte bestünde.This covers and protects the patient's lip. The dentist can carry out the necessary treatment steps inside the patient's mouth without the risk of mutual infections through mucous membrane contact.

Im Rahmen der Behandlungen führt der Zahnarzt regelmäßig Instrumente in den Mundinnenraum ein. Diese Instrumente haben meist Kontakt mit der Folie des Lippen/Wangen-Halters, und zwar sowohl beim Einführen als auch manchmal beim Entfernen. Die Instrumente haben meist einen metallischen Schaft und gleiten mit diesem an der Folie entlang.As part of the treatment, the dentist regularly inserts instruments into the inside of the mouth. These instruments usually come into contact with the lip/cheek retractor foil both during insertion and sometimes during removal. The instruments usually have a metallic shaft and slide along the foil.

Ein Saugschlauch eines Speichelsaugers wird beispielsweise über die Lippe und damit über die Folie des Lippen Wangen Halters gehängt und liegt dort kontinuierlich an.For example, a suction hose of a saliva ejector is hung over the lip and thus over the film of the lip cheek holder and lies there continuously.

Manchmal neigen Patienten dazu, während der Behandlung schlucken zu wollen und schließen hierbei unwillkürlich den Mund. Hierdurch entsteht eine Anlage zwischen dem Schaft des Instruments und sowohl der Unterlippe als auch der Oberlippe, genauer gesagt, je der dortigen Folie. Die Folie soll natürlich auch unter diesem Anlagedruck in ihrer Funktion erhalten bleiben und insbesondere nicht an dem Schaft des Instruments anhaften.Sometimes patients tend to want to swallow during treatment and close their mouths involuntarily. This creates a contact between the shaft of the instrument and both the lower lip and the upper lip, or more precisely, the foil there. The film should of course retain its function even under this contact pressure and in particular should not adhere to the shaft of the instrument.

Daher ist es aus der DE 10 2005 015 406 B4 bekannt geworden, eine recht gut gleitfähige Folie zu verwenden. Jedoch stellt sich bei der mit dieser Folie vorgenommenen Erprobung ein sogenannter "Stick-Slip-Effekt" ein, der die Scanergebnisse verfälschte.Therefore it is from the DE 10 2005 015 406 B4 It has become known to use a film that slides quite well. However, when testing with this film, a so-called “stick-slip effect” occurred, which distorted the scan results.

Die Verwendung einer recht gut gleitfähigen Folie stellt einen Kompromiss dar. Zum einen soll die Folie so dünn wie möglich sein, um sich geschmeidig an den Mund des Patienten anpassen zu können. Zum anderen soll sie reißfest sein.The use of a film that slides well represents a compromise. On the one hand, the film should be as thin as possible in order to be able to adapt smoothly to the patient's mouth. On the other hand, it should be tear-resistant.

Das Material der Wahl für die Folie ist typischerweise ein Elastomer. Dieses ist hochelastisch, hat aber gummiartige Eigenschaften. Bei der Einführung eines Intraoralscanners in den Mund des Patienten, der typischerweise einen Kunststoffschaft aufweist, entsteht leicht der sogenannte Stick-Slip-Effekt. Dieser führt dazu, dass der Scanner kurz an der Folie hängen bleibt und sich dann bei der Weiterführung der Bewegung des Scanners wieder von der Folie löst.The material of choice for the film is typically an elastomer. This is highly elastic, but has rubber-like properties. When an intraoral scanner, which typically has a plastic shaft, is inserted into the patient's mouth, the so-called stick-slip effect easily occurs. This causes the scanner to briefly get stuck on the film and then detach itself from the film as the scanner continues to move.

Für eine 3D-Aufnahme des Zahnbogens des Patienten ist es aber notwendig, dass der Scanner mit gleichbleibender Geschwindigkeit um den Zahnbogen geführt wird. Bleibt er an der Folie hängen, wird der Fluss der Bewegung unterbrochen, und der Scanprozess kann abreissen. Auch wird die Aufmerksamkeit des Zahnarztes vom eigentlichen Erfassen der 3D-Aufnahmen abgelenkt. Die Führungskraft muss vergrößert werden, um den Scanner erneut in Bewegung zu setzen. Typischerweise entsteht eine eher ruckartige Bewegung.However, in order to take a 3D image of the patient's dental arch, it is necessary that the scanner is moved around the dental arch at a constant speed. If it gets stuck on the film, the flow of movement is interrupted and the scanning process can stop. The dentist's attention is also distracted from actually capturing the 3D images. The executive must be enlarged to set the scanner in motion again. Typically, a rather jerky movement occurs.

Die Probleme vergrößern sich noch, wenn der Patient aufgrund des Fremdkörpereffekts den Mund zu schließen versucht, da dann der Anpressdruck zwischen dem Schaft und der Folie erhöht wird.The problems are exacerbated when the patient tries to close their mouth due to the foreign body effect, as the contact pressure between the shaft and the foil is then increased.

Der Zahnarzt könnte sich behelfen, indem er die Folie und oder den Schaft mit einem Gleitmittel einreibt. Ein solches Vorgehen läuft jedoch dem Vorteil der Anwendung entgegen, mit Lippen/Wangenhalter ein anwenderfreundliches und simples Accessoire ohne zusätzliche Vorberitung zur Verfügung zu stellenThe dentist could help by rubbing the foil and/or the shaft with a lubricant. However, such an approach runs counter to the advantage of providing a user-friendly and simple accessory with lip/cheek holders without additional preparation

Demgegenüber liegt der Erfindung die Aufgabe zugrunde, einen Lippen/Wangen-Halter gemäß dem Oberbegriff von Anspruch 1 und ein System aus einem Intraoralscanner und einem Lippen/Wangen-Halter gemäß dem Oberbegriff von Anspruch 16 zu schaffen, der für einen störungsfreien Arbeitsablauf in der Zahnarztpraxis besser geeignet ist.In contrast, the invention is based on the object of providing a lip/cheek holder according to the preamble of claim 1 and a system consisting of one To create an intraoral scanner and a lip/cheek holder according to the preamble of claim 16, which is better suited for a trouble-free workflow in the dental practice.

Diese Aufgabe wird erfindungsgemäß durch die Ansprüche 1 und 16 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.This object is achieved according to the invention by claims 1 and 16. Advantageous further developments result from the subclaims.

Erfindungsgemäß ist es vorgesehen dann, die Folie des Lippen/Wangen-Halters mindestens an den relevanten Stellen, also an den Stellen, an denen eine Anlage zu einem Schaft entstehen kann, mit einem durch eine Behandlung der betreffenden Oberfläche der Folie erzeugten Gleitelement zu versehen.According to the invention, it is then provided that the film of the lip/cheek holder is provided with a sliding element produced by treating the relevant surface of the film at least at the relevant points, i.e. at the points where contact with a shaft can occur.

Die Folie wird hierdurch nicht oder zumindest nicht relevant dicker, sodass sie in ihrer Geschmeidigkeit erhalten bleibt. Das Gleitelement kann entweder eine in atomarer Abscheidung erzeugte Beschichtung oder eine Oberflächenmodifikation sein. Es hat einen wesentlich geringeren Gleitreibungskoeffizient als ein typisches gummiartiges Elastomer. Dieser kann beispielsweise 1,5 oder 1,0 betragen.This does not make the film thicker, or at least not significantly so, so that it retains its suppleness. The sliding element can be either an atomic deposition coating or a surface modification. It has a significantly lower coefficient of sliding friction than a typical rubber-like elastomer. This can be, for example, 1.5 or 1.0.

Das Gleitelement ist deutlich härter und dementsprechend auch spröder als der Folienkörper im Übrigen. Überraschend haben Versuche ergeben, dass in der Praxis denn noch eine mindestens gleich gute Sicherheit der Folie des Lippen/Wangen-Halter gegen ein Reißen besteht. Dies liegt wohl darin begründet, dass der Stick-Slip-Effekt mit Sicherheit vermieden wird und daher Kräfte, denen die Folie bei der Handhabung ausgesetzt ist, signifikant vermindert sind.The sliding element is significantly harder and therefore more brittle than the rest of the film body. Surprisingly, tests have shown that in practice the film of the lip/cheek holder is at least equally safe against tearing. This is probably due to the fact that the stick-slip effect is certainly avoided and therefore the forces to which the film is exposed during handling are significantly reduced.

Dies gilt insbesondere für den bukkalen Bereich des Lippen/Wangen-Halter. Dort ist der Schaft des Lippen/Wangen-Halters typischerweise an drei Seiten in Anlage mit der Folie, und daher der Anlagedruck am größten. Dennoch ist auch hier erfindungsgemäß die gleichmäßige Gleitbewegung sichergestellt.This is particularly true for the buccal area of the lip/cheek retainer. There the shaft of the lip/cheek holder is typically in contact with the film on three sides, and therefore the contact pressure is greatest. Nevertheless, according to the invention, the uniform sliding movement is also ensured here.

Das Gleitelement kann auch durch eine Kombination aus atomarer Abscheidung und Oberflächenmodifikation, oder nur durch atomare Abscheidung, erzeugt werden. Bei einer Oberflächenbeschichtung mit Siliziumdioxid lässt sich zugleich eine Oberflächenmodifikation realisieren.The sliding element can also be created by a combination of atomic deposition and surface modification, or only by atomic deposition. When a surface is coated with silicon dioxide, a surface modification can also be achieved.

Erfindungsgemäß bestehen keine losen Werkstoffe wie bei einer Gleitmittel-Beschichtung. Eine sterile Arbeitsumgebung ist allzeit gewährleistet.According to the invention, there are no loose materials as in a lubricant coating. A sterile working environment is guaranteed at all times.

Die erfindungsgemäße Bereitstellung eines besonders niedrigen Gleitreibungskoeffizienten liegt gegenüber allen in der Praxis vorkommenden Materialien von Schäften vor. Ein dentaler Spiegel als dentales Instrument hat typischerweise einen metallischen Schaft. Ein Intraoralscanner hat typischerweise einen auswechselbaren Scankopf. Dieser kann beispielsweise aus Polyurethan oder besser aus autoklavierbarem Polysulfon bestehen. Gegenüber diesen Materialien ist der Gleitreibungskoeffizient erfindungsgemäß geringer als 2.The provision according to the invention of a particularly low coefficient of sliding friction is compared to all shaft materials that occur in practice. A dental mirror as a dental instrument typically has a metallic shaft. An intraoral scanner typically has a replaceable scan head. This can, for example, consist of polyurethane or, better, autoclavable polysulfone. Compared to these materials, the coefficient of sliding friction is, according to the invention, less than 2.

Das erfindungsgemäße Gleitelement erstreckt sich in vorteilhafter Ausgestaltung nur auf der Innenseite des im Ausgangszustand im Wesentlichen schlauchförmigen Lippen/Wangen-Halters. Entweder ist die Innenseite vollständig mit dem Gleitelement versehen. Oder nur der mittlere Bereich der Innenseite, also der Bereich, der von beiden Ringen beabstandet ist und am Lippenübergang zur Mundhöhle aufliegt, ist mit den Gleitelement versehen. Diese Lösung hat den Vorteil, dass es nicht zur Anlage zwischen dem Gleitelement und der Schleimhaut des Patienten kommt, auch nicht im Vestibulum, da angrenzend an den Vestibulärring die Folie dann kein Gleitelement aufweist. Es ist auch möglich, das Gleitelement nur angrenzend an den Vestibulärring wegzulassen, also beispielsweise nur über den 20 oder 30% der Länge des Lippen/Wangen-Halters, die an den Vestibulärring angrenzen.In an advantageous embodiment, the sliding element according to the invention extends only on the inside of the essentially tubular lip/cheek holder in the initial state. Either the inside is completely provided with the sliding element. Or only the middle area of the inside, i.e. the area that is spaced from both rings and rests at the lip transition to the oral cavity, is provided with the sliding element. This solution has the advantage that there is no contact between the sliding element and the patient's mucous membrane, not even in the vestibule, since the film then has no sliding element adjacent to the vestibular ring. It is also possible to omit the sliding element only adjacent to the vestibular ring, for example only over the 20 or 30% of the length of the lip/cheek holder that adjoins the vestibular ring.

Weitere Vorteile, Einzelheiten und Merkmale ergeben sich aus der nachfolgenden Beschreibung mehrerer Ausführungsbeispiele der Erfindung anhand der Zeichnung.Further advantages, details and features emerge from the following description of several exemplary embodiments of the invention based on the drawing.

Es zeigen:

Fig. 1
eine schematische Ansicht eines Systems aus einem Intraoralscanner und einem Lippen/Wangen-Halter in einer ersten erfindungsgemäßen Ausführungsform;
Fig. 2
eine vergrößerte Darstellung der Ausführungsform gemäß Fig. 1;
Fig. 3
eine Ausschnittvergrößerung eines Details aus Fig. 2, jedoch unter Darstellung einer anderen Ausführungsform der Erfindung;
Fig. 4
eine Darstellung gemäß Fig. 3, jedoch in einer dritten erfindungsgemäßen Ausführungsform der Erfindung; und
Fig. 5
eine Darstellung gemäß Fig. 3, jedoch in einer vierten erfindungsgemäßen Ausführungsform der Erfindung.
Show it:
Fig. 1
a schematic view of a system consisting of an intraoral scanner and a lip/cheek holder in a first embodiment according to the invention;
Fig. 2
an enlarged view of the embodiment according to Fig. 1 ;
Fig. 3
an enlargement of a detail Fig. 2 , but illustrating another embodiment of the invention;
Fig. 4
a representation according to Fig. 3 , but in a third embodiment of the invention according to the invention; and
Fig. 5
a representation according to Fig. 3 , but in a fourth embodiment of the invention according to the invention.

In Fig. 1 ist ein Intraoralscanner 10 und ein Lippen/Wangen-Halter 12 dargestellt. Der Intraoralscanner 10 weist eine Greifhandhabe 14 und einen Schaft 16 auf. Der Schaft 16 ist mit dem Scankopf 18 zusammen abnehmbar und an der Greifhandhabe 14 lösbar befestigt. Der Durchmesser des Schafts 16 beträgt im dargestellten Ausführungsbeispiel 20mm. Der Scanner 10 wird für den scan am Zahnbogen entlang geführt. Er wird in das Vestibulum 26 eingeführt. Hierzu muss die Oberlippe 30 - und bei dem betreffenden Scan natürlich auch die Unterlippe 28 - eingedrückt werden, um mit dem Scankopf 18 auf die Höhe des betreffenden Zahnbogens zu gelangen. Dies bedingt einen entsprechenden Anpressdruck.In Fig. 1 an intraoral scanner 10 and a lip/cheek holder 12 are shown. The intraoral scanner 10 has a gripping handle 14 and a shaft 16. The shaft 16 can be removed together with the scanning head 18 and is releasably attached to the gripping handle 14. The diameter of the shaft 16 is 20mm in the illustrated embodiment. The scanner 10 is guided along the dental arch for the scan. It is introduced into the vestibule 26. For this purpose, the upper lip 30 - and of course also the lower lip 28 in the case of the scan in question - must be pressed in in order to reach the height of the relevant dental arch with the scan head 18. This requires a corresponding contact pressure.

Der erfindungsgemäße Lippen/Wangen-Halter 12 besteht aus einer Folie 20 und einen Lippenring 22 und einen Vestibulärring 24. Die Folie 20 erstreckt sich zwischen dem Lippenring 22 und dem Vestibulärring 24. Damit bildet die Folie 20 zwischen den Ringen einen schlauchförmigen Abschnitt aus. Der Vestibulärring 24 hat einen etwas geringeren Durchmesser als der Lippenring 22 und ist dafür bestimmt, im Vestibulum 26 eines Patienten eingelegt zu werden. In aufgespanntem Zustand des Lippen/Wangen-Halter 12 weist dieser zwischen dem Lippenring 22 und dem Vestibulärring 24 eine Einschnürung auf.The lip/cheek holder 12 according to the invention consists of a film 20 and a lip ring 22 and a vestibular ring 24. The film 20 extends between the lip ring 22 and the vestibular ring 24. The film 20 thus forms a tubular section between the rings. The vestibular ring 24 has a slightly smaller diameter than the lip ring 22 and is intended to be inserted into the vestibule 26 of a patient. When the lip/cheek holder 12 is stretched, it has a constriction between the lip ring 22 and the vestibular ring 24.

Die Folie 20 bedeckt in an sich bekannter Weise die Unterlippe 28 und die Oberlippe 30 des Patienten und verhindert die direkte Anlage zwischen den Lippen 28 und 30 und dem Schaft 16, und zwar auch dann, wenn der Patient seine Lippen um den Schaft 16 schließt.The film 20 covers the lower lip 28 and the upper lip 30 of the patient in a manner known per se and prevents direct contact between the lips 28 and 30 and the shaft 16, even when the patient closes his lips around the shaft 16.

Die Folie 20 hat eine Innenseite 32 und eine Außenseite 34. Die Innenseite 32 ist die Seite, die zum Schaft 16 hin weist, und die Außenseite 34 ist die Seite, die zu den Lippen 28 und 30 weist.The film 20 has an inside 32 and an outside 34. The inside 32 is the side facing the shaft 16 and the outside 34 is the side facing the lips 28 and 30.

Erfindungsgemäß ist die Innenseite 32 der Folie 20 mit einem Gleitelement 36 versehen. Das Gleitelement 36 ist durch eine Oberflächenbehandlung der Folie 20, genauer gesagt der Innenseite 32 der Folie, erzeugt worden und weist einen geringen Gleitreibungskoeffizienten von 1 auf.According to the invention, the inside 32 of the film 20 is provided with a sliding element 36. The sliding element 36 has been produced by a surface treatment of the film 20, more precisely the inside 32 of the film, and has a low coefficient of sliding friction of 1.

Das Gleitelement 36 erstreckt sich über die Innenseite 32 des schlauchförmigen Abschnitts der Folie 20 lediglich im Bereich der Einschnürung, also von den Ringen beabstandet.The sliding element 36 extends over the inside 32 of the tubular section of the film 20 only in the area of the constriction, i.e. at a distance from the rings.

Die Folie 20 hat in dem dargestellten Ausführungsbeispiel eine Stärke von 0,2 mm. Das Gleitelement 36 hat eine Stärke im atomaren Bereich oder etwas über dem atomaren Bereich. Das Gleitelement 36 wird so erzeugt, dass es mit der Folie fest verankert ist. Im dargestellten Ausführungsbeispiel gemäß den Figuren 1 und 2 besteht es aus Siliciumdioxid-Partikeln, die mindestens teilweise in die Oberfläche der Folie 20 eingebettet sind. Diese besondere Art der Oberflächenbeschichtung ermöglicht es, dass sich auch bei hohen Scherbelastungen keine Elemente des Gleitelements 36 von der Folie 20 lösen können.In the exemplary embodiment shown, the film 20 has a thickness of 0.2 mm. The sliding element 36 has a thickness in the atomic range or slightly above the atomic range. The sliding element 36 is created so that it is with the film is firmly anchored. In the illustrated embodiment according to Figures 1 and 2 it consists of silicon dioxide particles that are at least partially embedded in the surface of the film 20. This special type of surface coating makes it possible for no elements of the sliding element 36 to detach from the film 20, even under high shear loads.

Aus Fig. 2 ist eine etwas vergrößerte Ansicht des Anlagebereichs an der eingekreisten Stelle gemäß Fig. 1 zwischen dem Gleitelement 36 und dem Schaft 16 ersichtlich. Die Folie 20 mit dem Gleitelement 36 wird durch die Anlage an dem Schaft 16 in eine gerade Form gebracht, und die Lippe 30 wird entsprechend verformt. In Fig. 2 ist die Dicke des Gleitelement 36 übertrieben dargestellt, damit das Gleitelement 36 überhaupt dargestellt werden kann. Eine Relativbewegung zwischen dem Intraoralscanner 10 und der Lippe 30 ist erfindungsgemäß mit ganz geringer Kraft möglich, auch wenn ein typischer Anpressdruck von 1 bis 10 Newton besteht.Out of Fig. 2 is a slightly enlarged view of the investment area at the circled location Fig. 1 between the sliding element 36 and the shaft 16 can be seen. The film 20 with the sliding element 36 is brought into a straight shape by the contact with the shaft 16, and the lip 30 is deformed accordingly. In Fig. 2 the thickness of the sliding element 36 is shown exaggerated so that the sliding element 36 can be shown at all. According to the invention, a relative movement between the intraoral scanner 10 and the lip 30 is possible with very little force, even if there is a typical contact pressure of 1 to 10 Newton.

Mit dem erfindungsgemäßen Gleitelement 36 ist sichergestellt, dass kein Stick-Slip-Effekt entsteht, vielmehr erfolgt bei der Bewegung in der Richtung 40 ein gleichmäßiges Gleiten zwischen dem Schaft 16 und dem Lippen/Wangen-Halter 12. Der Unterschied zwischen Haftreibung und Gleitreibung ist entsprechend gering.The sliding element 36 according to the invention ensures that no stick-slip effect occurs; rather, when moving in the direction 40, there is a uniform sliding between the shaft 16 and the lip/cheek holder 12. The difference between static friction and sliding friction is corresponding small amount.

In Fig. 3 ist eine Ausschnittsvergrößerung entsprechend dem in Fig. 2 dargestellten Kreis ersichtlich. Bei der Ausführungsform gemäß Fig. 3 kommt ein anderes erfindungsgemäßes Gleitelement 36 zum Einsatz. Die Folie 20 ist bei der Ausführungsform gemäß Fig. 3 mit Para-Xylylene beschichtet. Auch hier handelt es sich um eine atomare Abscheidung. Die Oberfläche der Para-Xylylene-Beschichtung ist homogener und glatt und bietet einen geringen Gleitreibungskoeffizienten gegenüber dem aus Polysulfon bestehenden Schaft 16.In Fig. 3 is an enlargement of the detail corresponding to that in Fig. 2 circle shown. In the embodiment according to Fig. 3 another sliding element 36 according to the invention is used. The film 20 is in the embodiment according to Fig. 3 coated with para-xylylene. This is also an atomic separation. The surface of the Para-Xylylene coating is more homogeneous and smooth and offers a low coefficient of sliding friction compared to the shaft 16 made of polysulfone.

Der Gleitreibungskoeffizient beträgt mit gewissen Schwankungen im Durchschnitt zwischen 0,9 und 1,2.The coefficient of sliding friction averages between 0.9 and 1.2, with certain fluctuations.

Eine demgegenüber weiter modifizierte Ausführungsform eines erfindungsgemäßen Lippen/Wangen-Halters 12 ist aus Fig. 4 ersichtlich. Bei dieser Ausführungsform sind Mikrostrukturen auf oder an der Oberfläche des Elastomers der Folie 20 erzeugt. Diese bestehen aus Bergen 42 und Tälern 44, die einander abwechseln. Die Berge 42 springen zum Schaft 16 hin vor und die Täler 44 springen von diesem zurück.A further modified embodiment of a lip/cheek holder 12 according to the invention is available Fig. 4 visible. In this embodiment, microstructures are created on or on the surface of the elastomer of the film 20. These consist of mountains 42 and valleys 44, which alternate with each other. The mountains 42 project towards the shaft 16 and the valleys 44 project back from it.

Lediglich die Berge bilden Kontaktbereiche 46. Die Kontaktbereiche 46 des Gleitelements 36 verbleiben bei Dehnung der Folie 20 unverändert oder im Wesentlichen, also zu mehr als 80%, unverändert, und die Dehnung vergrößert die Abstände zwischen den Kontaktbereichen 46.Only the mountains form contact areas 46. The contact areas 46 of the sliding element 36 remain unchanged or essentially, i.e. more than 80%, unchanged when the film 20 is stretched, and the stretching increases the distances between the contact areas 46.

Die Berge 42 sind gleichmäßig über die Oberfläche des Gleitelements 36 verteilt. Die Größe der Berge 42, also die Dicke der Mikrostruktur 48 kann in beliebiger geeigneter Weise gewählt werden, beispielsweise zwischen dem atomaren Bereich und wenigen Mikrometern. Die Mikrostruktur 48 kann in Negativform in die Oberfläche einer Spritzgussform eingearbeitet werden, und durch das Spritzgießen entsteht dann automatisch die Mikrostruktur 48 des Gleitelements 36.The mountains 42 are evenly distributed over the surface of the sliding element 36. The size of the mountains 42, i.e. the thickness of the microstructure 48, can be chosen in any suitable manner, for example between the atomic range and a few micrometers. The microstructure 48 can be incorporated in negative form into the surface of an injection mold, and the injection molding then automatically creates the microstructure 48 of the sliding element 36.

Eine demgegenüber weiter modifizierte Ausführungsform eines erfindungsgemäßen Lippen/Wangen-Halters 12 ist aus Fig. 5 ersichtlich. Bei dieser Ausführungsform sind Mikrostrukturen 48 in Form von Pyramiden ausgebildet. Diese weisen spitze Berge 42 und Täler 44 auf, die ebenfalls spitz zulaufen. Die Ausgestaltung der Täler spielt jedoch keine Rolle hinsichtlich des Haftreibungskoeffizienten.A further modified embodiment of a lip/cheek holder 12 according to the invention is available Fig. 5 visible. In this embodiment, microstructures 48 are designed in the form of pyramids. These have pointed mountains 42 and valleys 44, which also taper to a point. However, the design of the valleys plays no role with regard to the coefficient of static friction.

Diese Ausgestaltung ergibt noch geringere Reibungskoeffizienten als die gemäß Fig. 4 mit den balligen Bergen 42.This configuration results in even lower coefficients of friction than those according to Fig. 4 with the spherical mountains 42.

Es wurden Versuche zur Haftreibung und zur Gleitreibung mit Polysulfon als Reibungspartner durchgeführt. Polysulfon wurde gewählt, da der Schaft 16 von Intraoralscannern 10 häufig aus Polysulfon besteht. Der Anpressdruck wurde zwischen 1 und 5 N variiert. Die Bewegungsgeschwindigkeit bei der Gleitreibungsmessung betrug etwa 6mm/s.Tests on static friction and sliding friction were carried out with polysulfone as a friction partner. Polysulfone was chosen because the shaft 16 of intraoral scanners 10 often consists of polysulfone. The contact pressure was varied between 1 and 5 N. The movement speed during the sliding friction measurement was approximately 6mm/s.

Ferner wurde die Mikrostruktur-Größe geändert zwischen den Rastermassen 50µm und 200 µm und der Pyramidenhöhe zwischen 24 µm und 87 µm.Furthermore, the microstructure size was changed between the grid masses 50 µm and 200 µm and the pyramid height between 24 µm and 87 µm.

Der Reibungskoeffizient wurde je nach Anpressdruck im Vergleich mit einem Elastomerstreifen zwischen 22 und 25 %, oder bei einer anderen Versuchsanordnung um 37%, reduziert, und zwar bei der maximalen geprüften Mikrostruktur-Größe.Depending on the contact pressure, the coefficient of friction was reduced by between 22 and 25% in comparison with an elastomer strip, or by 37% in another test arrangement, at the maximum tested microstructure size.

Eine erheblich größere Schwankungsbreite ergab sich bei einer Vergleichsmessung mit einer Siloxan-Beschichtung anstelle der Mikrostruktur 48. Die Reduktion des Reibungskoeffizienten schwankte dann je nach Anspressdruck zwischen 21 und 49%.A significantly larger range of fluctuations was found in a comparison measurement with a siloxane coating instead of the microstructure 48. The reduction in the coefficient of friction then fluctuated between 21 and 49% depending on the contact pressure.

Wesentlich ist, dass der Unterschied zwischen Haftreibungskoeffizient und Gleitreibungskoeffizient bei der erfindungsgemäßen Ausgestaltungen je geringer als bei einer unbeschichteten und unbehandelten Elastomerfolie war.It is important that the difference between the coefficient of static friction and the coefficient of sliding friction in the embodiments according to the invention was smaller than in an uncoated and untreated elastomer film.

Dieser Effekt reicht aus, um den Stick-Slip-Effekt zu vermeiden. Die erfindungsgemäßen Ausführungsformen haben den besonderen Vorteil, dass je ein vergleichsweise geringer Unterschied zwischen Haftreibungskoeffizient und Gleitreibungskoeffizient bestehtThis effect is enough to avoid the stick-slip effect. The embodiments according to the invention have the particular advantage that there is a comparatively small difference between the coefficient of static friction and the coefficient of sliding friction

Messungen haben ergeben, dass eine unbeschichtete und unbehandelte Elastomerfolie wie ein Standard-Optragate einen Hafttreibungskoeffizient von etwa 3,5 bis 4 und Gleitreibungskoeffizient von etwa 2,5 hat.Measurements have shown that an uncoated and untreated elastomeric film such as a standard Optragate has a coefficient of static friction of around 3.5 to 4 and a coefficient of sliding friction of around 2.5.

Claims (16)

  1. A lip/cheek retainer comprising a film made of elastomer, a lip ring and a vestibular ring, said film extending between the lip ring and the vestibular ring, being held stretched by them and forming a tubular section between them, characterized in that the film (20) is provided in a prefabricated manner on the inner side (32) of its tubular section pointing to a shaft with a sliding element (36), firmly connected to the film (20), produced by a surface treatment which in particular alters the surface of the film (20) thereat.
  2. The lip/cheek retainer according to claim 1, characterized in that the size specification of the sliding friction coefficient µG of the sliding element (36) refers to the material pairing film/shape-retaining plastic or film/metal.
  3. The lip/cheek retainer according to claim 1 or 2, characterized in that the sliding element (36) has a coating of SiO2 firmly connected to the film (20) to provide the sliding friction coefficient.
  4. The lip/cheek retainer according to one of the preceding claims, characterized in that the sliding element (36) is produced by a combination of atomic deposition and surface modification, or surface texturing.
  5. The lip/cheek retainer according to claim 1 or 2, characterized in that the sliding element (36) comprises a coating of para-xylylene firmly connected to the film (20) to provide the sliding friction coefficient
  6. The lip/cheek retainer according to claim 1 or 2, characterized in that, to provide the sliding friction coefficient, the sliding element (36) has a microstructure (48) produced by injection moulding and having peaks (42) (projecting regions) and valleys (44) (recessed regions), the peaks (42) of which are in particular harder than the elastomer of the film (20) and in particular occupy less than 30% of the surface of the sliding element (20).
  7. The lip/cheek retainer according to one of the preceding claims, characterized in that the sliding element (36) has contact regions (46), the size of each of which lies between the atomic range and a few um and which are uniformly distributed over the sliding element (36).
  8. The lip/cheek retainer according to one of claims 6 or 7, characterized in that peaks (42), projecting regions or protruding regions of the microstructure (48) form the contact regions (46).
  9. The lip/cheek retainer according to one of the preceding claims, characterized in that contact regions (46) of the sliding element remain unchanged or substantially unchanged, i.e. more than 80%, when the film (20) is stretched, and the stretching increases the distances between the contact regions (46) .
  10. The lip/cheek retainer according to one of the preceding claims, characterized in that the sliding element (36) extends over the entire inner side (32) of the tubular section of the film (20).
  11. The lip/cheek retainer according to one of the claims 1 to 11, characterized in that the film (20) in the stretched state has a constriction between the lip ring and the vestibular ring and that the sliding element extends over the inner side of the tubular section of the film only in the region of the constriction, i.e. at a distance from the rings.
  12. The lip/cheek retainer according to one of the preceding claims, characterized in that the sliding element (36) has a thickness of between 2 um and 200 um, preferably 5 to 150 µm.
  13. The lip/cheek retainer according to one of the preceding claims, characterized in that the sliding element (36) is applied to and firmly connected to the film (20).
  14. The lip/cheek retainer according to one of the preceding claims, characterized in that the sliding element (36) has a lower elasticity than the elastomer of the film (20) and is harder than the latter.
  15. The lip/cheek retainer according to one of the preceding claims, characterized in that the sliding element (36) is configured to be water-repellent.
  16. A system comprising an intraoral scanner and a lip/cheek retainer, said intraoral scanner having an outer housing made of plastic and/or metal and said lip/cheek retainer having a lip ring, a vestibular ring and a film made of elastomer which extends between the lip ring and the vestibular ring, is held stretched by these and forms a tubular section between them, characterized in that the film (20) is provided in a prefabricated manner on the inner side (32) of its tubular section pointing to a shaft with a sliding element (36), with respect to the shaft (16) of the intraoral scanner (10), which is firmly connected to the film (20) and produced by a surface treatment which in particular alters the surface of the film (20) thereat.
EP21197991.9A 2021-09-21 2021-09-21 Lip/cheek holder and system comprising intra-oral scanner and lip/cheek holder Active EP4151175B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
ES21197991T ES2965361T3 (en) 2021-09-21 2021-09-21 Lip/cheek holder and system comprising an intraoral scanner and a lip/cheek holder
EP21197991.9A EP4151175B1 (en) 2021-09-21 2021-09-21 Lip/cheek holder and system comprising intra-oral scanner and lip/cheek holder
CN202210795750.7A CN115836832A (en) 2021-09-21 2022-07-06 Lip and cheek retractor and system comprising an intra-oral scanner and a lip and cheek retractor
KR1020220083449A KR20230042549A (en) 2021-09-21 2022-07-07 Lip/cheek retainer and system comprising an intraoral scanner and lip/cheek retainer
US17/933,738 US20230094777A1 (en) 2021-09-21 2022-09-20 Lip/Cheek Retainer And System
JP2022150338A JP2023046315A (en) 2021-09-21 2022-09-21 Labial/cheek fixture and system composed of intraoral scanner and labial/cheek fixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21197991.9A EP4151175B1 (en) 2021-09-21 2021-09-21 Lip/cheek holder and system comprising intra-oral scanner and lip/cheek holder

Publications (3)

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EP4151175A1 EP4151175A1 (en) 2023-03-22
EP4151175C0 EP4151175C0 (en) 2023-10-25
EP4151175B1 true EP4151175B1 (en) 2023-10-25

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Application Number Title Priority Date Filing Date
EP21197991.9A Active EP4151175B1 (en) 2021-09-21 2021-09-21 Lip/cheek holder and system comprising intra-oral scanner and lip/cheek holder

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US (1) US20230094777A1 (en)
EP (1) EP4151175B1 (en)
JP (1) JP2023046315A (en)
KR (1) KR20230042549A (en)
CN (1) CN115836832A (en)
ES (1) ES2965361T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6299438B1 (en) * 1997-09-30 2001-10-09 Implant Sciences Corporation Orthodontic articles having a low-friction coating
JP3339813B2 (en) * 1997-12-17 2002-10-28 高志 秋廣 Opening device
JP2003093397A (en) * 2001-09-26 2003-04-02 Yutaka Teruya Hygienic implement
CH695235A8 (en) * 2001-12-17 2006-03-31 Domonkos Dr Horvath Lip and cheek expander.
DE102005015406B4 (en) * 2005-04-04 2012-03-29 Ivoclar Vivadent Ag Covering and holding element for the trouble-free performance of dental operations on teeth and method for its production
US9119664B2 (en) * 2010-12-20 2015-09-01 Covidien Lp Integral foam port
JP6311146B2 (en) * 2012-12-28 2018-04-18 東レ・メディカル株式会社 Single-hole laparoscopic surgery device
CN206518583U (en) * 2016-08-02 2017-09-26 成都五义医疗科技有限公司 A kind of puncture outfit diaphragm seal and puncture outfit seal assembly comprising inverted groove
EP3666221B1 (en) * 2018-12-12 2024-06-19 Ivoclar Vivadent AG Film tensioning element

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EP4151175C0 (en) 2023-10-25
CN115836832A (en) 2023-03-24
ES2965361T3 (en) 2024-04-15
KR20230042549A (en) 2023-03-28
EP4151175A1 (en) 2023-03-22
JP2023046315A (en) 2023-04-03
US20230094777A1 (en) 2023-03-30

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